We present a nucleon-nucleon potential at fifth order in chiral effective field theory. We find a substantial improvement in the description of nucleon-nucleon phase shifts as compared to the fourth-order results utilizing a coordinate-space regularization. This provides clear evidence of the corresponding two-pion exchange contributions with all low-energy constants being determined from pion-...

Based on the spectator expansion of multiple scattering series we employ a chiral next-to-next-to-leading order (NNLO) nucleon-nucleon interaction same footing in structure as well reaction calculation to obtain an leading-order consistent effective potential for nucleon-nucleus elastic scattering, which includes spin struck target nucleon. As example present proton off $^{12}$C.

Changes in the nucleon shape are investigated by letting the nucleon deform under the strong interactions with another nucleon. The parameters of the axial deformations are obtained by minimizing the static energy of the two nucleon system at each internucleon distance R. It is shown that the intrinsic quadrupole moment of the interacting proton, Qp, is about 0.02fm at distances near R ∼ 1.25 f...

Nucleon-nucleon scattering is studied to next-to-leading order in a partially-quenched extension of an effective field theory used to describe multinucleon systems in QCD. The partially-quenched nucleon-nucleon amplitudes will play an important role in relating lattice simulations of the two-nucleon sector to nature.